The acceleration due to gravity remains constant at approximately 9.8 m/s² regardless of whether the body is falling towards the ground or has reached the ground.

Here's why:

* Acceleration due to gravity is a constant: It's determined by the mass of the Earth and the distance between the object and the Earth's center.

* Impact doesn't change gravity: When an object hits the ground, its acceleration changes abruptly due to the impact force. However, the acceleration due to gravity itself doesn't change instantly.

Important Note: Once the object hits the ground, it's no longer in freefall. The impact causes other forces to come into play, such as the normal force from the ground, which will stop the object's downward motion.